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    <title>Layer Groups</title>
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        <div class="span12">
          <h4 id="title">Layer Groups</h4>
          <div id="map" class="map"></div>
<div id="layertree">
  <h5>Click on layer nodes below to change their properties.</h5>
  <ul>
    <li><span>OSM layer</span>
      <fieldset id="layer0">
        <label class="checkbox" for="visible0">
          <input id="visible0" class="visible" type="checkbox"/>visibility
        </label>
        <label>opacity</label>
        <input class="opacity" type="range" min="0" max="1" step="0.01"/>
      </fieldset>
    </li>
    <li><span>Layer group</span>
      <fieldset id="layer1">
        <label class="checkbox" for="visible1">
          <input id="visible1" class="visible" type="checkbox"/>visibility
        </label>
        <label>opacity</label>
        <input class="opacity" type="range" min="0" max="1" step="0.01"/>
      </fieldset>
      <ul>
        <li><span>Food insecurity layer</span>
          <fieldset id="layer10">
            <label class="checkbox" for="visible10">
              <input id="visible10" class="visible" type="checkbox"/>visibility
            </label>
            <label>opacity</label>
            <input class="opacity" type="range" min="0" max="1" step="0.01"/>
          </fieldset>
        </li>
        <li><span>World borders layer</span>
          <fieldset id="layer11">
            <label class="checkbox" for="visible11">
              <input id="visible11" class="visible" type="checkbox"/>visibility
            </label>
            <label>opacity</label>
            <input class="opacity" type="range" min="0" max="1" step="0.01"/>
          </fieldset>
        </li>
      </ul>
    </li>
  </ul>
</div>

        </div>
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        <div class="span12">
          <p id="shortdesc">Example of a map with layer group.</p>
          <div id="docs"><p>Example of a map with layer group.</p>
</div>
          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.layer.Group.html" title="API documentation for ol.layer.Group">ol.layer.Group</a></li>,<li><a href="../apidoc/ol.layer.Tile.html" title="API documentation for ol.layer.Tile">ol.layer.Tile</a></li>,<li><a href="../apidoc/ol.proj.html" title="API documentation for ol.proj">ol.proj</a></li>,<li><a href="../apidoc/ol.source.OSM.html" title="API documentation for ol.source.OSM">ol.source.OSM</a></li>,<li><a href="../apidoc/ol.source.TileJSON.html" title="API documentation for ol.source.TileJSON">ol.source.TileJSON</a></li></ul></div>
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          <a id="codepen-button"><i class="fa fa-codepen"></i> Edit</a>
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        <form method="POST" id="codepen-form" target="_blank" action="https://codepen.io/pen/define/">
          <textarea class="hidden" name="title">Layer Groups</textarea>
          <textarea class="hidden" name="description">Example of a map with layer group.</textarea>
          <textarea class="hidden" name="js">var map &#x3D; new ol.Map({
  layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    }), new ol.layer.Group({
      layers: [
        new ol.layer.Tile({
          source: new ol.source.TileJSON({
            url: &#x27;https://api.tiles.mapbox.com/v3/mapbox.20110804-hoa-foodinsecurity-3month.json?secure&#x27;,
            crossOrigin: &#x27;anonymous&#x27;
          })
        }),
        new ol.layer.Tile({
          source: new ol.source.TileJSON({
            url: &#x27;https://api.tiles.mapbox.com/v3/mapbox.world-borders-light.json?secure&#x27;,
            crossOrigin: &#x27;anonymous&#x27;
          })
        })
      ]
    })
  ],
  target: &#x27;map&#x27;,
  view: new ol.View({
    center: ol.proj.fromLonLat([37.40570, 8.81566]),
    zoom: 4
  })
});

function bindInputs(layerid, layer) {
  var visibilityInput &#x3D; $(layerid + &#x27; input.visible&#x27;);
  visibilityInput.on(&#x27;change&#x27;, function() {
    layer.setVisible(this.checked);
  });
  visibilityInput.prop(&#x27;checked&#x27;, layer.getVisible());

  var opacityInput &#x3D; $(layerid + &#x27; input.opacity&#x27;);
  opacityInput.on(&#x27;input change&#x27;, function() {
    layer.setOpacity(parseFloat(this.value));
  });
  opacityInput.val(String(layer.getOpacity()));
}
map.getLayers().forEach(function(layer, i) {
  bindInputs(&#x27;#layer&#x27; + i, layer);
  if (layer instanceof ol.layer.Group) {
    layer.getLayers().forEach(function(sublayer, j) {
      bindInputs(&#x27;#layer&#x27; + i + j, sublayer);
    });
  }
});

$(&#x27;#layertree li &gt; span&#x27;).click(function() {
  $(this).siblings(&#x27;fieldset&#x27;).toggle();
}).siblings(&#x27;fieldset&#x27;).hide();
</textarea>
          <textarea class="hidden" name="css">#layertree li &gt; span {
  cursor: pointer;
}</textarea>
          <textarea class="hidden" name="html">&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
&lt;div id&#x3D;&quot;layertree&quot;&gt;
  &lt;h5&gt;Click on layer nodes below to change their properties.&lt;/h5&gt;
  &lt;ul&gt;
    &lt;li&gt;&lt;span&gt;OSM layer&lt;/span&gt;
      &lt;fieldset id&#x3D;&quot;layer0&quot;&gt;
        &lt;label class&#x3D;&quot;checkbox&quot; for&#x3D;&quot;visible0&quot;&gt;
          &lt;input id&#x3D;&quot;visible0&quot; class&#x3D;&quot;visible&quot; type&#x3D;&quot;checkbox&quot;/&gt;visibility
        &lt;/label&gt;
        &lt;label&gt;opacity&lt;/label&gt;
        &lt;input class&#x3D;&quot;opacity&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;0&quot; max&#x3D;&quot;1&quot; step&#x3D;&quot;0.01&quot;/&gt;
      &lt;/fieldset&gt;
    &lt;/li&gt;
    &lt;li&gt;&lt;span&gt;Layer group&lt;/span&gt;
      &lt;fieldset id&#x3D;&quot;layer1&quot;&gt;
        &lt;label class&#x3D;&quot;checkbox&quot; for&#x3D;&quot;visible1&quot;&gt;
          &lt;input id&#x3D;&quot;visible1&quot; class&#x3D;&quot;visible&quot; type&#x3D;&quot;checkbox&quot;/&gt;visibility
        &lt;/label&gt;
        &lt;label&gt;opacity&lt;/label&gt;
        &lt;input class&#x3D;&quot;opacity&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;0&quot; max&#x3D;&quot;1&quot; step&#x3D;&quot;0.01&quot;/&gt;
      &lt;/fieldset&gt;
      &lt;ul&gt;
        &lt;li&gt;&lt;span&gt;Food insecurity layer&lt;/span&gt;
          &lt;fieldset id&#x3D;&quot;layer10&quot;&gt;
            &lt;label class&#x3D;&quot;checkbox&quot; for&#x3D;&quot;visible10&quot;&gt;
              &lt;input id&#x3D;&quot;visible10&quot; class&#x3D;&quot;visible&quot; type&#x3D;&quot;checkbox&quot;/&gt;visibility
            &lt;/label&gt;
            &lt;label&gt;opacity&lt;/label&gt;
            &lt;input class&#x3D;&quot;opacity&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;0&quot; max&#x3D;&quot;1&quot; step&#x3D;&quot;0.01&quot;/&gt;
          &lt;/fieldset&gt;
        &lt;/li&gt;
        &lt;li&gt;&lt;span&gt;World borders layer&lt;/span&gt;
          &lt;fieldset id&#x3D;&quot;layer11&quot;&gt;
            &lt;label class&#x3D;&quot;checkbox&quot; for&#x3D;&quot;visible11&quot;&gt;
              &lt;input id&#x3D;&quot;visible11&quot; class&#x3D;&quot;visible&quot; type&#x3D;&quot;checkbox&quot;/&gt;visibility
            &lt;/label&gt;
            &lt;label&gt;opacity&lt;/label&gt;
            &lt;input class&#x3D;&quot;opacity&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;0&quot; max&#x3D;&quot;1&quot; step&#x3D;&quot;0.01&quot;/&gt;
          &lt;/fieldset&gt;
        &lt;/li&gt;
      &lt;/ul&gt;
    &lt;/li&gt;
  &lt;/ul&gt;
&lt;/div&gt;
</textarea>
          <input type="hidden" name="resources" value="https://openlayers.org/en/v4.4.2/css/ol.css,https://openlayers.org/en/v4.4.2/build/ol.js,https://code.jquery.com/jquery-2.2.3.min.js">
          <input type="hidden" name="data">
        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
  &lt;head&gt;
    &lt;title&gt;Layer Groups&lt;/title&gt;
    &lt;link rel="stylesheet" href="https://openlayers.org/en/v4.4.2/css/ol.css" type="text/css"&gt;
    &lt;!-- The line below is only needed for old environments like Internet Explorer and Android 4.x --&gt;
    &lt;script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"&gt;&lt;/script&gt;
    &lt;script src="https://openlayers.org/en/v4.4.2/build/ol.js"&gt;&lt;/script&gt;
    &lt;script src&#x3D;&quot;https://code.jquery.com/jquery-2.2.3.min.js&quot;&gt;&lt;/script&gt;
    &lt;style&gt;
      #layertree li &gt; span {
        cursor: pointer;
      }    &lt;/style&gt;
  &lt;/head&gt;
  &lt;body&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;div id&#x3D;&quot;layertree&quot;&gt;
      &lt;h5&gt;Click on layer nodes below to change their properties.&lt;/h5&gt;
      &lt;ul&gt;
        &lt;li&gt;&lt;span&gt;OSM layer&lt;/span&gt;
          &lt;fieldset id&#x3D;&quot;layer0&quot;&gt;
            &lt;label class&#x3D;&quot;checkbox&quot; for&#x3D;&quot;visible0&quot;&gt;
              &lt;input id&#x3D;&quot;visible0&quot; class&#x3D;&quot;visible&quot; type&#x3D;&quot;checkbox&quot;/&gt;visibility
            &lt;/label&gt;
            &lt;label&gt;opacity&lt;/label&gt;
            &lt;input class&#x3D;&quot;opacity&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;0&quot; max&#x3D;&quot;1&quot; step&#x3D;&quot;0.01&quot;/&gt;
          &lt;/fieldset&gt;
        &lt;/li&gt;
        &lt;li&gt;&lt;span&gt;Layer group&lt;/span&gt;
          &lt;fieldset id&#x3D;&quot;layer1&quot;&gt;
            &lt;label class&#x3D;&quot;checkbox&quot; for&#x3D;&quot;visible1&quot;&gt;
              &lt;input id&#x3D;&quot;visible1&quot; class&#x3D;&quot;visible&quot; type&#x3D;&quot;checkbox&quot;/&gt;visibility
            &lt;/label&gt;
            &lt;label&gt;opacity&lt;/label&gt;
            &lt;input class&#x3D;&quot;opacity&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;0&quot; max&#x3D;&quot;1&quot; step&#x3D;&quot;0.01&quot;/&gt;
          &lt;/fieldset&gt;
          &lt;ul&gt;
            &lt;li&gt;&lt;span&gt;Food insecurity layer&lt;/span&gt;
              &lt;fieldset id&#x3D;&quot;layer10&quot;&gt;
                &lt;label class&#x3D;&quot;checkbox&quot; for&#x3D;&quot;visible10&quot;&gt;
                  &lt;input id&#x3D;&quot;visible10&quot; class&#x3D;&quot;visible&quot; type&#x3D;&quot;checkbox&quot;/&gt;visibility
                &lt;/label&gt;
                &lt;label&gt;opacity&lt;/label&gt;
                &lt;input class&#x3D;&quot;opacity&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;0&quot; max&#x3D;&quot;1&quot; step&#x3D;&quot;0.01&quot;/&gt;
              &lt;/fieldset&gt;
            &lt;/li&gt;
            &lt;li&gt;&lt;span&gt;World borders layer&lt;/span&gt;
              &lt;fieldset id&#x3D;&quot;layer11&quot;&gt;
                &lt;label class&#x3D;&quot;checkbox&quot; for&#x3D;&quot;visible11&quot;&gt;
                  &lt;input id&#x3D;&quot;visible11&quot; class&#x3D;&quot;visible&quot; type&#x3D;&quot;checkbox&quot;/&gt;visibility
                &lt;/label&gt;
                &lt;label&gt;opacity&lt;/label&gt;
                &lt;input class&#x3D;&quot;opacity&quot; type&#x3D;&quot;range&quot; min&#x3D;&quot;0&quot; max&#x3D;&quot;1&quot; step&#x3D;&quot;0.01&quot;/&gt;
              &lt;/fieldset&gt;
            &lt;/li&gt;
          &lt;/ul&gt;
        &lt;/li&gt;
      &lt;/ul&gt;
    &lt;/div&gt;
    &lt;script&gt;
      var map &#x3D; new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          }), new ol.layer.Group({
            layers: [
              new ol.layer.Tile({
                source: new ol.source.TileJSON({
                  url: &#x27;https://api.tiles.mapbox.com/v3/mapbox.20110804-hoa-foodinsecurity-3month.json?secure&#x27;,
                  crossOrigin: &#x27;anonymous&#x27;
                })
              }),
              new ol.layer.Tile({
                source: new ol.source.TileJSON({
                  url: &#x27;https://api.tiles.mapbox.com/v3/mapbox.world-borders-light.json?secure&#x27;,
                  crossOrigin: &#x27;anonymous&#x27;
                })
              })
            ]
          })
        ],
        target: &#x27;map&#x27;,
        view: new ol.View({
          center: ol.proj.fromLonLat([37.40570, 8.81566]),
          zoom: 4
        })
      });

      function bindInputs(layerid, layer) {
        var visibilityInput &#x3D; $(layerid + &#x27; input.visible&#x27;);
        visibilityInput.on(&#x27;change&#x27;, function() {
          layer.setVisible(this.checked);
        });
        visibilityInput.prop(&#x27;checked&#x27;, layer.getVisible());

        var opacityInput &#x3D; $(layerid + &#x27; input.opacity&#x27;);
        opacityInput.on(&#x27;input change&#x27;, function() {
          layer.setOpacity(parseFloat(this.value));
        });
        opacityInput.val(String(layer.getOpacity()));
      }
      map.getLayers().forEach(function(layer, i) {
        bindInputs(&#x27;#layer&#x27; + i, layer);
        if (layer instanceof ol.layer.Group) {
          layer.getLayers().forEach(function(sublayer, j) {
            bindInputs(&#x27;#layer&#x27; + i + j, sublayer);
          });
        }
      });

      $(&#x27;#layertree li &gt; span&#x27;).click(function() {
        $(this).siblings(&#x27;fieldset&#x27;).toggle();
      }).siblings(&#x27;fieldset&#x27;).hide();
    &lt;/script&gt;
  &lt;/body&gt;
&lt;/html&gt;</code></pre>
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